Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hieu van » hieu va, thien van, lieu va
nang cho » nang chon, ngang cho, nang cao
cho hoc » co hoc, khoa hoc
sach tu » sach thu, cach tu, sach uu
cac xuc » cam xuc, chat xuc, cac cuoc
sach ty » sach y, sach thu, xach tay
cua cau » cua cac, cua chu, cua cay
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((sach tu) OR (sach ty)) nang cho hoc. hieu van ((cac xuc) or (cac nuoc)) van hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((sach tu) OR (sach ty)) nang cho hoc. hieu van ((cac xuc) OR (cac nuoc)) van hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((sach tu) OR (sach ty)) nang cho hoc. hieu van ((cac xuc) or (cac nuoc)) van hanh vi cua cau*".